Python 使用imaplib fetch时的MemoryError

请帮帮我，当我试图取回一封特定的电子邮件时，我遇到了记忆错误。这是错误消息：

python(23838,0x1888c00) malloc: *** vm_allocate(size=3309568) failed (error code=3)
python(23838,0x1888c00) malloc: *** error: can't allocate region
python(23838,0x1888c00) malloc: *** set a breakpoint in szone_error to debug
Exception in thread Thread-1:Traceback (most recent call last):
  File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/threading.py", line 442, in __bootstrap
    self.run()
  File "/Volumes/SvnDevDisk/branches/HaversackProject_Version_0.2/plugins/GaMailClientPlugin/python/imap/imap_reader.py", line 25, in run
    self.readMailbox(eachMailbox)
  File "/Volumes/SvnDevDisk/branches/HaversackProject_Version_0.2/plugins/GaMailClientPlugin/python/imap/imap_reader.py", line 58, in readMailbox
    resp, content = _mailConnection.fetch(num, '(RFC822 FLAGS)')
  File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/imaplib.py", line 417, in fetch
    typ, dat = self._simple_command(name, message_set, message_parts)
  File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/imaplib.py", line 1004, in _simple_command
    return self._command_complete(name, self._command(name, *args))
  File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/imaplib.py", line 830, in _command_complete
    typ, data = self._get_tagged_response(tag)
  File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/imaplib.py", line 935, in _get_tagged_response
    self._get_response()
  File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/imaplib.py", line 896, in _get_response
    data = self.read(size)
  File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/imaplib.py", line 231, in read
    return self.file.read(size)
  File "/System/Library/Frameworks/Python.framework/Versions/2.3/lib/python2.3/socket.py", line 301, in read
    data = self._sock.recv(recv_size)
MemoryError

这是我的代码：

resp, content = _mailConnection.fetch(num, '(RFC822 FLAGS)')

我正在使用python 2.3.5

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提前谢谢

内存错误通常表示系统的可用内存不足。也许您的Python脚本保留了对它看到的所有消息的引用，而这些消息的总和太大，无法放入内存中？

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a_lauer建议的修复方法似乎解决了我的问题。

我尝试获取耗尽内存的特定消息，其大小几乎为5MB。我对python相当陌生，对于如何有效地获取大型消息，特别是那些带有大型附件的消息，有什么建议吗。谢谢